Combined gramophonic and telephonic sound duct



Jan. 1927.

E. A. GRAHAM COMBINED GRAMOPHONIC AND TELEPHONIC SOUND DUCT 2 Sheet-Shet 1 Filed Ma'flch 20, 1925 INVENTOR maghmmmm Z421 Jttanngs i 1,613,512 Jan. 4, 1927. E, GRAHAM COMBINED GRAMOPHONIC AND TELEPHONIC SOUND DUCT Filed March 20, 1925 2 Sheets-Sheet 2 I VEI'VTOF? V mm czgmzmm A @M Jtorngw Patented Jan. 4, 1927.

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EDWARD ALFRED GRAHAM, OF LONDON, ENGLAND; MARIA GRAHAM AND ALFRED GRAHAM EXECUTORS 0F SAID EDXVARD ALFRED GRAHAM, DECEASED.

COMBINED GRAMOPI-IONI'C AND TELEPHONIG SOUND DUCT.

Application filed March 20, 1925, Serial No.

In the Specification of my application Serial No. 713,23t, tiled 14 May, 1924, there is described an invention which consists in introducing the sound duct associated with a wireless telephone receiver into the sound duct associated with a gramophone or the like in suchwise as to enable a single horn or acoustic amplifier common to the two sound reproducers to be effectively employed. Included in the examples chosen for illustration is a gramophone tone arm supported by a stationary mounting of any ordinary or commercial type, except that it isprovided with the duct off a telephonic receiver to be introduced into the sound duct ot' the gramophone. a

The object of the present invention is to ell'ectfurther improvements and it consists in utilizing an internal stationary or fixed portion of the mounting of a gramophone tone arm, which portion constitutes part of the introduced sound duct of any telephonic receiver, as a means for carrying, in whole or in part, the said gramophone tone arm.

To this end, the portion of the telephonic duct introduced into the gramophone duct is adapted to co-operate with the tone arm, or a fitting or fittings thereof.

In the accompanying drawings,.whereot Fig. l is a perspective view illustrating the general appearance of a combined gramophone tone arm, a mounting therefor and telephonic receiver, Figs. 2, 3, 4 and 5 are vertical sections depicting tour different constructional arrangei'nents according to the invention. Fig. (3 is an elevation at right angles to Fig. i. Fig. 7 is a sectional detail view showing a further modification.

As shown in Fig. 2, the mounting a, which is fixed to that portion Z) of a grainephone, known as the motor-board, and is formed interiorl y with the member a constituting the emission extremity of a sound duct from a telephonic receiver, such as (Z (Fig. 1), is, in addition, formed with a boss 0 bored to constitute a plainbearing for a pivot pin f, carried by a spider g in the tone arm g, and for a retaining screw it. Thctone arm is thus supported entirely by the hearing at e, as it also is in the case of Fi g. 3, which differs only from 2 in that races are provided to receive balls 2' between a collar j onthe pin 7 and the boss 0 and also 17,109, and in Great Britain April 3, 1924.

ballskbetween the. latter and the head of the retaining screw it. v V

In Fig. 4, the tone arm is supported in part by the hearing at e, having a single race of balls 76, and in part by a race of balls 2' interposed between the tone arm properand the mounting a. a

Fig. 5 illustrates a modification in which the member 0 is provided with a bearing arrangementthe same as that shown in Fig. 2, the tone'arm g, however, being of a type that is movable about the horizontal axis of a pin m in relation to the pivot pin A spring a, coiled around the pin m, is shown as provided to take parts of the weight of the tone arm so that undue pressure shall not be exercised by the stylus on the disc record in cases where, unlike that of Fig. 1 in which a goose neck 0 is employed, the gramophone reproducer or sound box is rigidly attached to the outer extremity of the tone arm.

Figs. fl and 6 further illustrate the tone arm as equipped with a valve 10 by means of which the volume of sound from the gramophone reproducer or sound box can be regulated, or by which the acustic passages in the tone arm can be entirely closed when desired, the aperture being varied or closed by manipulating the valve, as through the linkage r, spindles and exterior knob 23.

To those versed in the art or telepathy and with knowledge of gramophone design and construction, itwill be obvious that the present invention can be carried out in divers manners without departing from the essential feature or spirit of the invent-ion which provides a gramophone tone arm or acoustic conduit into which is introduced a duct from a telephonic receiver in an advantageous manner, considered acoustically, at the same time providing an in'iproved and useful mechanical means for mounting or carrying the movable portion ofthe combined arrangement.

. Thus, the upper part otthe bearing portion 6 of the duct 0, may as'shown at e in Fig. 7, be adapted to act as a fixed spindle,

journal, arbor or the like to co-operate with a bearing 9 formed in or carried bythe movable tone arm, as for instance by the central portion or boss 9 10i the spider 9 the pin that fixed the said boss to the pin 7' in Fig. 2, being then removed. 01' the pin f of Fig. 2, may be fixed to the bearing poi tion e'otthe sound duct 0, "as'by tightening up the screw it sui'licientlyto causeit and a collar f on'the pin to clamp the bearing portion 0 between them, so that by removing the aforesaid pin 7" the said pin Will serve as a fixed spindle, journal, or arbor for the bearing portion g Oftll spindle and tone arm.

What'l clainr'is 1. Combined gramophonic and telephonic sound duets ofthe kind herein i'ei eri' ed'to, comprising a graino-phone sound ducthaving stationary and movable "portions and a telephonic. sound duct extending-into the stationary portion or said grainophonic' sound du'ct' andupon whichthe'inovable port-ion of sai d duct bears.

:2. Combined graino phonic and telephonic sound ductsofthe kind herein reterredto, comprising a 'granrophonic sound ducthaving stationary and movable portions and a telephonic sound duct extending into tlie'stationary portion of said giamophonic "sound duct and forming a bearing" that 'Wholly supports 'the movable portion of the"gramoplionicfsoun'd duct.

3. Combined*grainophonic and telephonic sound ducts, otltind herein referred to, comprising Stationary and movable portions of a "grainophonic sound duct a telephonic said secondn'ientioned bearing.

i. In c'oi'nbined 'rarno honic and telei 1 i b .1 phonic soundfducts'otthe kind herein referred to ar ramo honic sound conduit comprising a" movable tone arm and a stationary mounting therefor, ateleph'onrc sound con du' t' aportion' of which extends into said mounting and a pivotal connect-ion between the portion of the "telephonic sound duct within said mounting and the adjacent end of the tonearin.

"In combined gramophonic "and telephonic sound ducts of the kind herein referred toa i'a nio honio'stiu'nd conduitbornprising a movable tone arm and a stationary mounting therefor, a telephonicsouiid conduit a portion ot'lvvhio'h eXtendsinto said mounting. and a ver cal pivot carried by the portion of the telephonic sound duct within said mounting and enacting with the adjacent end of the tone arnl and about the axis'ot which said tone arm can turn;

6.111 combined g 'rainophonic and telephonic sound ducts of the kind herein reierred to a gramophonic sound conduit c01nprising a movable tone arm and a stationary mounting therefor, a telephonicsound conduit, a portion of whichextends into said mount-mg and is adapted to form a bearing, and a pivotal connection attached to the. ad

jacent end of saidtone'ariiia-nd mouiited to.

till

adapted to take part'ot the Weight-0f the tone arm.

8. Combined gram'ophonic and telephonic sound ducts comprising stationary and movable portions of a gramophonic sound duct and telephonic so'un'd' duct extending into the stationary portion of the gramophone sound ductand ineans forregulating'the volume oisound emitted. from" said gramophonic sound'duct.

9. Combined gramophonic and telephonic sound ducts comprising stationaryand movable portions of a g g'rainopl-ioni'c sound duct, a telephonic sound duct {extent-ling into the stationary portion "of the graniophonio sound duct/and hand operated means for regulating the volume of sound emitted from said 'gra'inophonic sound duct.

10. Combined grainophonic and telephonic sound tluots'eo'mprising' stationary and movable portionsota gramophon'ie sound duct, a telephonic sound ducteXtend-ing into the stationary portion or thegra-moplfonic' sound duct, 21' valve located 'Within the movablep'ortion of said gramo ahonicsound duetand hand operated means-forregulating t-l'ie position'of-said valvean'd the volume brewed emitted from "said-grainophonicsound duct.

11. In combined gran'i'ophonio and telephonic sound ducts oit the"kind hereinreprisinga movable tone ar nfand a stationary mounting therefor, a telephonic sound dii'ct a portion of which extends into-said mountsound "passing through said gramo 1waic Sound duct.

12.111 combined wgrarnophonic and an: phonic sound ducts of the kind'herein're- 'fterred to, a gramophon'lc sound conduit comprising amovable tonearin and-astationary mounting therefor, a telephonic sound conduit a portion of which extends into said mounting, a pivotal connection between the portion of the telephonic sound duct Within said mounting and the adjacent end of said tone arm, a flap valve for regulating the volunie of sound passing through said gramophonic sound duct and hand operated mechanism for manipulating said valve to close said valve or to open it to varying extents. 10

Signed at London, England, this ninth day of March, 1925.

EDWARD ALFRED GRAHAM. 

